Mining-induced seismicity in the Nottinghamshire Coalfield
Mining-induced seismicity in the Nottinghamshire Coalfield
复制标题
诺丁汉郡煤田采矿引发的地震活动
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
M. Allen
中科院分区：
文献类型：
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作者：
I. Bishop;I. Bishop;Peter Styles;M. Allen
摘要1989年7月至1990年8月间，英国伯明翰郡埃德温斯托地区的居民共感觉到并报告了130多次地震。为了确定地震是否由采矿活动引起，在Thoresby煤矿采煤区周围建立了一个由8个临时地面地震仪站组成的小孔径阵列。在接下来的11个月里，检测到785次微震事件。可以清楚地看到，这种地震活动的空间和时间模式与开始，继续提取和关闭的面孔。活动在周末、节假日和因天气原因被迫关闭期间最少，每周周三最多。事件发生在面部完全生产的几天内，并在生产结束时停止，面部前进和震源位置之间具有良好的相关性。虽然阵列外的事件的位置不如Thoresby take内的事件，但很明显，有非常强烈的迹象表明，这些事件中的大多数来自邻近的煤矿，特别是Welbeck、Ollerton和剪切石。虽然结果确定了煤炭生产和当地微震活动之间的因果关系，但频率震级研究表明，地震危险性和财产损害风险很低，因为在此期间记录的最大震级不到2.5。
Abstract Between July 1989 and August 1990 over 130 earth tremors were felt and reported by people living in the Edwinstowe district of Nottinghamshire. In order to determine whether the tremors were caused by mining activity, a small aperture array of eight temporary surface seismometer stations was established around the area of coal extraction from Thoresby Colliery. Over the following l 1-month period, 785 micro seismic events were detected. The spatial and temporal patterns of this seismicity can clearly be seen to be associated with the commencement, the continuing extraction and the closure of faces. Activity is at a minimum at weekends, holidays and during periods of enforced closure due to the weather, rising to a maximum on the Wednesday of each week. Events occur within days of a face going into full production and cease at the end of the production, with good correlation between face advancement and hypocentral position. While the location of events outside of the array is inferior to those within the Thoresby take, it is clear that there are very strong indications that the majority of these events originate from the adjacent collieries, especially Welbeck, Ollerton and Clipstone. While the results establish a definite causal relationship between coal production and the local microseismicity, frequency magnitude studies suggest that the seismic hazard and risk of damage to properties is low, as the maximum magnitude recorded during this period was less than 2.5.